Integrated water-cooled variable ceramic vacuum capacitor

Abstract

The present invention discloses an integrated water-cooled variable ceramic vacuum capacitor, comprising: an outer shell, a mounting base, a guide sleeve, an adjustment component, a double-layer bellows installed in the outer shell, and an electrode, wherein the mounting base is fixedly mounted on the top of the outer shell, the guide sleeve is fixedly connected to the mounting base, and a water circulation channel is formed between the guide sleeve and the mounting base; the adjustment component comprises a pull rod, which is slidably mounted in the guide sleeve and fixedly connected to the moving electrode of the electrode; the double-layer bellows is sleeved outside the guide sleeve, and the double-layer bellows comprises an inner layer bellows and an outer layer bellows, one end of the inner layer bellows and the outer layer bellows are both fixedly connected to the mounting base, and the other end is both fixedly connected to the moving electrode. The present invention fundamentally changes the manufacturing process of the product by adopting a double-layer bellows structure, greatly saves production costs, and improves production efficiency.

Description

Technical Field

[0001] The invention relates to the field of vacuum capacitors, and in particular to an integrated water-cooled variable ceramic vacuum capacitor. Background Art

[0002] Vacuum capacitors are capacitors that use vacuum as the medium. The electrode group of this capacitor is a group of concentric cylindrical electrodes formed by stretching high-conductivity oxygen-free copper strip through a set of high-precision molds and sealed in a vacuum container. Its performance is stable and reliable, and it is not easy to produce arcing, corona and other phenomena. Vacuum capacitors are divided into two main categories: vacuum capacitors with fixed capacitance, in which the geometric relationship between the electrodes remains unchanged; variable capacitors, in which the shape, orientation or spacing of one or both electrodes can be changed, thereby changing the capacitance of the device.

[0003] Traditional variable ceramic vacuum capacitors, due to the limitation of bellows materials (mostly tin bronze or beryllium bronze), the whole tube is mostly sealed by argon arc welding, and then the jaws are sealed after cleaning, drying, and high-pressure aging exhaust on a vacuum exhaust table. The production efficiency of capacitors using this technology is low, the production cost is high, and there are jaw remnants on the products, which need to be protected with epoxy resin or other materials; at the same time, traditional variable ceramic vacuum capacitors cannot effectively cool down, which reduces the service life of the capacitors. Summary of the invention

[0004] The problem to be solved by the present invention is to provide an integrated water-cooled variable ceramic vacuum capacitor to overcome the defects of the variable ceramic vacuum capacitor in the prior art, such as low production efficiency, high production cost, residual jaws left on the product, inability to effectively cool down, and short service life.

[0005] The technical solution adopted by the present invention to solve its technical problems is: an integrated water-cooled variable ceramic vacuum capacitor, comprising: an outer shell, a mounting base, a guide sleeve, an adjustment assembly, a double-layer bellows installed in the outer shell, and an electrode, the mounting base is fixedly installed on the top of the outer shell, the guide sleeve is fixedly connected to the mounting base, and a water circulation channel is formed between the guide sleeve and the mounting base, and the guide sleeve is provided with a water inlet and a water outlet that are interconnected with the water circulation channel; the adjustment assembly includes a pull rod, the pull rod is slidably installed in the guide sleeve and is fixedly connected to the moving electrode of the electrode; the double-layer bellows is sleeved on the outside of the guide sleeve, the double-layer bellows includes an inner bellows for providing a vacuum environment for the electrode and an outer bellows for conducting electricity with the electrode, one end of the inner bellows and the outer bellows are fixedly connected to the mounting base, and the other end is fixedly connected to the moving electrode.

[0006] As a further improvement of the present invention, an annular groove is provided on the mounting base, a truncated cone connecting portion is provided on the top of the guide sleeve, and the truncated cone connecting portion and the annular groove form the water circulation channel.

[0007] As a further improvement of the present invention, the adjustment assembly also includes a sleeve, a screw and a positioning nut, the sleeve is fixedly installed on the top of the guide sleeve, the positioning nut is fixedly installed in the top of the pull rod, and the screw is rotatably installed in the sleeve and threadedly connected with the positioning nut.

[0008] As a further improvement of the present invention, a bearing is provided between the upper end of the sleeve and the screw.

[0009] As a further improvement of the present invention, a chamber for the pull rod to move up and down is arranged in the sleeve.

[0010] As a further improvement of the present invention, a vacuum getter is also installed in the outer shell.

[0011] As a further improvement of the present invention, the vacuum getter is a zirconium-aluminum getter.

[0012] As a further improvement of the present invention, the material used for the inner layer bellows is stainless steel.

[0013] As a further improvement of the present invention, the material used for the outer layer bellows is copper alloy.

[0014] As a further improvement of the present invention, the outer shell is made of ceramic.

[0015] The beneficial effects of the present invention are:

[0016] 1. The double-layer bellows structure is adopted. The inner bellows is made of stainless steel, which can isolate the high vacuum inside and outside, and is strong and durable. The outer bellows is made of high-temperature resistant copper alloy material, which can ensure the high conductivity of the capacitor under radio frequency conditions. The whole tube is welded in a vacuum furnace and sealed and formed at one time, which fundamentally changes the production process of the product, eliminates the backward production processes such as cleaning, drying, high-pressure exhaust, and jaws, greatly saves production costs, and improves production efficiency and process reliability;

[0017] 2. The guide sleeve and the mounting base are welded into an integrated structure by high-temperature solder, and a water circulation channel is formed between the guide sleeve and the mounting base, which effectively reduces the heat generated by the bellows under high-frequency working conditions and greatly extends the mechanical life of the capacitor. Not only is the heat exchange effect good, but it also saves maintenance costs such as replacement of sealing rings;

[0018] 3. A zirconium-aluminum getter is installed at the bottom of the ceramic shell, which can continue to adsorb trace gases that may be released by devices and materials in a vacuum environment to maintain the vacuum degree of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention.

[0020] Combined with the accompanying drawings, the following description is given:

[0021] 1——Outer shell; 2——Mounting base;

[0022] 201——annular groove; 3——guide sleeve;

[0023] 301——water circulation channel; 302——truncated cone connection part;

[0024] 4——electrode; 401——moving electrode;

[0025] 5——Inner layer bellows; 6——Outer layer bellows;

[0026] 7——sleeve; 701——chamber;

[0027] 8——screw; 9——locating nut;

[0028] 10——vacuum getter; 11——bearing;

[0029] 12——Pull rod. DETAILED DESCRIPTION

[0030] A preferred embodiment of the present invention is described in detail below in conjunction with the accompanying drawings.

[0031] See also Figure 1 The present invention provides an integrated water-cooled variable ceramic vacuum capacitor, comprising: an outer shell 1, a mounting base 2, a guide sleeve 3, an adjustment component, a double-layer bellows installed in the outer shell 1, and an electrode 4. The outer shell 1 is made of ceramic, which has insulation performance and high dielectric withstand voltage, and can provide a high vacuum environment for the electrode 4. The mounting base 2 is fixedly mounted on the top of the outer shell 1, and a hole for inserting the guide sleeve 3 is provided at the center of the mounting base 2, and an annular groove 201 is provided around the hole; the mounting base 2 is also provided with a plurality of screw holes for installation. The guide sleeve 3 is inserted into the hole to be fixedly connected to the mounting base 2. The guide sleeve 3 is in a hollow mushroom shape, and the upper part is set as a truncated cone connecting part 302. The truncated cone connecting part 302 and the upper part of the annular groove 201, and the middle part of the guide sleeve 3 and the lower part of the annular groove 201 are welded by high-temperature solder, so that the mounting base 2 and the guide sleeve 3 are welded into an integrated structure, and the truncated cone connecting part 302 and the annular groove 201 form a water circulation channel 301; the guide sleeve 3 is provided with a water inlet and a water outlet interconnected with the water circulation channel 301, and water can circulate in and out to take away the heat generated by the double-layer bellows under radio frequency conditions, so as to achieve a rapid and effective cooling effect, thereby improving the performance and service life of the product.

[0032] Wherein, the adjustment component includes a sleeve 7, a screw 8, a positioning nut 9 and a pull rod 12. The pull rod 12 is slidably installed in the guide sleeve 3, and the guide sleeve 3 provides a vertical positioning function for the up and down movement of the pull rod 12. The electrode 4 is installed at the bottom of the outer shell 1, including a moving electrode 401 and a fixed electrode fixed at the bottom of the outer shell 1. The bottom of the pull rod 12 is fixedly connected to the moving electrode 401. The electrode 4 is a cylindrical electrode, and cylindrical high-conductivity oxygen-free copper is used as the electrode material. Capacitance is generated by coupling between electrodes. The sleeve 7 is fixedly installed at the top of the guide sleeve 3, and the positioning nut 9 is fixedly installed in the top of the pull rod 12 by locking thread glue. The screw 8 is rotatably installed in the sleeve 7, and the bottom end of the screw 8 is threadedly connected to the positioning nut 9, and the top end of the screw 8 is connected to an external motor.

[0033] Among them, a bearing 11 is arranged between the upper end of the sleeve 7 and the screw 8 to provide support for the screw 8. The bearing 11 is a thrust ball bearing, which can reduce the friction when the screw 8 rotates, so that the capacity adjustment system operates smoothly. A chamber 701 for the pull rod 12 to move up and down is arranged in the sleeve 7, and the top of the chamber 701 can limit the maximum stroke of the pull rod 12.

[0034] Among them, the double-layer bellows includes an inner bellows 5 and an outer bellows 6. The inner bellows 5 is sleeved on the outside of the guide sleeve 3. The material of the inner bellows 5 is stainless steel, which can provide a high vacuum environment for the electrode 4. The outer bellows 6 is sleeved on the outside of the inner bellows 5. The material of the outer bellows 6 is copper alloy, which has high temperature resistance, making the vacuum furnace welding process possible, and has high electrical conductivity, especially under radio frequency working conditions, ensuring the high conductivity of the product, reducing the heat generation of the product, and effectively reducing the power loss of the user. The top ends of the inner bellows 5 and the outer bellows 6 are welded and fixed to the mounting base 2, and the bottom ends are fixedly connected to the moving electrode 401.

[0035] Among them, a vacuum getter 10 is also installed in the outer shell 1. The vacuum getter 10 is a zirconium-aluminum getter, which can continue to adsorb trace gases that may be released by devices and materials in a vacuum environment to maintain the vacuum degree of the product.

[0036] To further illustrate this embodiment, the working principle of the present invention is: the external motor rotates to drive the screw 8 to rotate, and the rotation of the screw 8 is converted into the linear motion of the pull rod 12 through the positioning nut 9. The pull rod 12 drives the moving electrode 401 to move up and down, thereby realizing the adjustment of the capacitance of the capacitor.

[0037] In this embodiment, an integrated water-cooled variable ceramic vacuum capacitor adopts a double-layer bellows structure. The inner bellows is made of stainless steel material, which can isolate the internal and external high vacuum and is sturdy and durable. The outer bellows is made of high-temperature resistant copper alloy material, which can ensure the high conductivity characteristics of the capacitor under radio frequency conditions. The entire tube is welded in a vacuum furnace and sealed and formed in one time, which fundamentally changes the product manufacturing process and eliminates backward production processes such as cleaning, drying, high-pressure exhaust, and clamping, greatly saving production costs and improving production efficiency and process reliability.

[0038] Many specific details are described in the above description to facilitate a full understanding of the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited to the specific implementation disclosed above. At the same time, any person familiar with the art can make many possible changes and modifications to the technical solution of the present invention using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. An integrated water-cooled variable ceramic vacuum capacitor, characterized in that: include: An outer shell (1), a mounting base (2), a guide sleeve (3), an adjustment component, a double-layer bellows installed in the outer shell (1), and an electrode (4), wherein the mounting base (2) is fixedly mounted on the top of the outer shell (1), the guide sleeve (3) is fixedly connected to the mounting base (2), and a water circulation channel (301) is formed between the guide sleeve (3) and the mounting base (2), and the guide sleeve (3) is provided with a water inlet and a water outlet that are interconnected with the water circulation channel (301); the adjustment component includes a pull rod (12), the pull rod (12) is slidably mounted in the guide sleeve (3) and is fixedly connected to a movable electrode (401) of the electrode (4); the double-layer bellows is sleeved on the outside of the guide sleeve (3), and the double-layer bellows includes an inner bellows (5) for providing a vacuum environment for the electrode (4) and an outer bellows (6) for conducting electricity with the electrode (4). Tube (6), one end of the inner layer bellows (5) and the outer layer bellows (6) are fixedly connected to the mounting base (2), and the other end is fixedly connected to the moving electrode (401); an annular groove (201) is provided on the mounting base (2), and a truncated cone connecting portion (302) is provided on the top of the guide sleeve (3), and the truncated cone connecting portion (302) and the annular groove (201) enclose the water circulation channel (301); the adjustment component also includes a sleeve (7), a screw (8) and a positioning nut (9), the sleeve (7) is fixedly installed on the top of the guide sleeve (3), the positioning nut (9) is fixedly installed in the top of the pull rod (12), and the screw (8) is rotatably installed in the sleeve (7) and is threadedly connected to the positioning nut (9); the material used for the inner layer bellows (5) is stainless steel; the material used for the outer layer bellows (6) is copper alloy.

2. The integrated water-cooled variable ceramic vacuum capacitor according to claim 1, characterized in that: A bearing (11) is provided between the upper end of the sleeve (7) and the screw rod (8).

3. The integrated water-cooled variable ceramic vacuum capacitor according to claim 1, characterized in that: The sleeve (7) is provided with a chamber (701) for the pull rod (12) to move up and down.

4. The integrated water-cooled variable ceramic vacuum capacitor according to claim 1, characterized in that: A vacuum getter (10) is also installed in the outer shell (1).

5. The integrated water-cooled variable ceramic vacuum capacitor according to claim 4, characterized in that: The vacuum getter (10) is a zirconium-aluminum getter.

6. The integrated water-cooled variable ceramic vacuum capacitor according to claim 1, characterized in that: The material used for the outer shell (1) is ceramic.

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